Tone probe



FIG. 1 is an isometric top view of a tone probe according to the design;

FIG. 2 is front view thereof;

FIG. 3 rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings illustrate portions of the tone probe that form no part of the claimed design. 

CLAIM The ornamental design for a tone probe, as shown and described. 